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112 lines
3.1 KiB
C
112 lines
3.1 KiB
C
#include "commands.h"
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#define LOG_MODULE "commands"
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#define LOG_ENABLE_DBG 1
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#include "log.h"
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#include "terminal.h"
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#include "render.h"
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#include "grid.h"
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#define max(x, y) ((x) > (y) ? (x) : (y))
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#define min(x, y) ((x) < (y) ? (x) : (y))
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void
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cmd_scrollback_up(struct terminal *term, int rows)
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{
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if (term->grid == &term->alt)
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return;
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rows = min(rows, term->grid->num_rows - term->rows);
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assert(term->grid->offset >= 0);
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assert(rows <= term->rows);
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int new_view = (term->grid->view + term->grid->num_rows - rows) % term->grid->num_rows;
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assert(new_view >= 0);
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assert(new_view < term->grid->num_rows);
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/* Avoid scrolling in uninitialized rows */
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while (!term->grid->rows[new_view]->initialized)
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new_view = (new_view + 1) % term->grid->num_rows;
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/* Don't scroll past scrollback history */
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int end = (term->grid->offset + term->rows) % term->grid->num_rows;
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if (end >= term->grid->offset) {
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/* Not wrapped */
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if (new_view >= term->grid->offset && new_view < end)
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new_view = end;
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} else {
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if (new_view >= term->grid->offset || new_view < end)
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new_view = end;
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}
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LOG_DBG("scrollback UP: %d -> %d (offset = %d, rows = %d)",
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term->grid->view, new_view, term->grid->offset, term->grid->num_rows);
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if (new_view == term->grid->view)
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return;
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term->grid->view = new_view;
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for (int i = 0; i < term->rows; i++)
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grid_row_in_view(term->grid, i)->dirty = true;
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if (term->frame_callback == NULL)
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grid_render(term);
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}
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void
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cmd_scrollback_down(struct terminal *term, int rows)
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{
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if (term->grid == &term->alt)
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return;
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rows = min(rows, term->grid->num_rows - term->rows);
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assert(term->grid->offset >= 0);
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int new_view = (term->grid->view + rows) % term->grid->num_rows;
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assert(new_view >= 0);
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assert(new_view < term->grid->num_rows);
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/* Prevent scrolling in uninitialized rows */
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bool all_initialized = false;
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do {
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all_initialized = true;
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for (int i = 0; i < term->rows; i++) {
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int row_no = (new_view + i) % term->grid->num_rows;
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if (!term->grid->rows[row_no]->initialized) {
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all_initialized = false;
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new_view--;
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break;
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}
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}
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} while (!all_initialized);
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/* Don't scroll past scrollback history */
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int end = (term->grid->offset + term->rows) % term->grid->num_rows;
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if (end >= term->grid->offset) {
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/* Not wrapped */
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if (new_view >= term->grid->offset && new_view < end)
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new_view = term->grid->offset;
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} else {
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if (new_view >= term->grid->offset || new_view < end)
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new_view = term->grid->offset;
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}
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LOG_DBG("scrollback DOWN: %d -> %d (offset = %d, rows = %d)",
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term->grid->view, new_view, term->grid->offset, term->grid->num_rows);
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if (new_view == term->grid->view)
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return;
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term->grid->view = new_view;
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for (int i = 0; i < term->rows; i++)
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grid_row_in_view(term->grid, i)->dirty = true;
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if (term->frame_callback == NULL)
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grid_render(term);
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}
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